Adds comprehensive Settings page with multiple configuration tabs

Introduces a new Settings page with configurable modules:
- General company information
- Calendar and booking settings
- Billing and payment configurations
- Tracking and analytics integrations

Implements modular ViewComponents for each settings section
Enhances user experience with toggle switches and detailed configuration options

PlanTempus.Application/wwwroot/css/cash.css

@@ -114,7 +114,6 @@ swp-cash-table {
     justify-content: space-between;
     padding: var(--spacing-7) var(--spacing-10);
     background: var(--color-background-alt);
-    border-top: 1px solid var(--color-border);
     font-size: var(--font-size-md);
     color: var(--color-text-secondary);
   }